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Okay, I finally got mine dynoed. While not in the same league as Knotched and Foozrcool, I was pleased to see mine's made the same power as Knotched's first dyno run, despite having different mods.
What I have here is: Berklee straight thru rear muffler, US Galant 90mm intake, K&N filter, removed under-bonnet front rubber strip, removed plastic engine cover, and running 98 octane fuel.
So for people running these simple & affordable mods, this is roughly what you will recieve.

The video has been posted on YouTube also, and shows 139kW and 200+km/h. It is the ONLY video of a 380 having dyno power run.

Retired from Mitsubishi ownership after 13 years. (At least I can now open all my windows without breaking them)

The results were very close for all four configurations, ranging from 181.9kw to 183.6kw.

The stock air filter element consistently gave better results than the K&N.

Maybe because my K&N is a little dirty and the stocker is relatively clean.

I have not over oiled my K&N.

But there seems little doubt that the stocker is at least as good as the K&N if not slightly better.

With the intake lower resonator mod (end cut off and connected by a tube to the open driving light hole), it made very little difference to the power whether I had it open or blocked off, but surprisingly top end torque (5,000 rpm plus) was a bit better with it blocked off.

Steve was happy with the results and pleasantly surprised by them (me too!).

I asked him about a piggyback ECU and he reckoned I would be wasting my time considering the power & torque figures I am already getting. He said the stock ECU adapts very well to 98 RON (which I use exclusively), by advancing the timing and leaning out the AFR a bit, and a piggyback wouldn't do a better job.